Geometry

Question Analysis
This question involves determining the true biconditional statement based on a given condition.
The main focus is on ensuring that both the original statement and its converse are true.

Key Concept Explanation:
A biconditional statement requires both the original statement and its converse to be true, linked by "if and only if."

Step-by-Step Solution:
The given condition is: "If a triangle is right-angled, then it has one 90-degree angle."
The converse is: "If a triangle has one 90-degree angle, then it is right-angled."
Both the original statement and its converse are true.
Option A correctly combines both parts into a biconditional statement.

Option Analysis:
A) Correct, as it includes both the original statement and its converse.
B) ...